Zeng, Q.; Gao, S.; Lai, Y.; Liu, X. Improving the Directionality of Low-Frequency Acoustic Radiation by a Finite Array of Quadrupolar Sources with Acoustic Metamaterials. Crystals2023, 13, 101.
Zeng, Q.; Gao, S.; Lai, Y.; Liu, X. Improving the Directionality of Low-Frequency Acoustic Radiation by a Finite Array of Quadrupolar Sources with Acoustic Metamaterials. Crystals 2023, 13, 101.
Zeng, Q.; Gao, S.; Lai, Y.; Liu, X. Improving the Directionality of Low-Frequency Acoustic Radiation by a Finite Array of Quadrupolar Sources with Acoustic Metamaterials. Crystals2023, 13, 101.
Zeng, Q.; Gao, S.; Lai, Y.; Liu, X. Improving the Directionality of Low-Frequency Acoustic Radiation by a Finite Array of Quadrupolar Sources with Acoustic Metamaterials. Crystals 2023, 13, 101.
Abstract
Manipulation of radiation pattern control is challenging, especially at low frequencies. In this paper, we demonstrate that acoustic metamaterials as an effective array of quadrupoles can remarkably improve the directionality of acoustic radiation at low frequencies, compared with previous metamaterials as monopole and dipole structures. The directivity of the acoustic radiation can be adjusted by changing the characteristic parameter and the symmetry of the structure, which provide a flexible method of adjustable radiation di-rections. The directionality can be further improved by constructing linear array of structure. Our work opens an approach of acoustic radiation control via quadrupolar metamaterials.
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